Free Physics in Daily Life MCQs with Answers

231. ______ is the "Work done in moving a unit charge between two points in an electric circuit"?

• A. Potential difference
• B. Current
• C. Power
• D. Resistence

Explanation: Potential difference is the work done per unit charge in moving charge between two points, expressed as V = W/Q. Current measures charge flow per unit time, while power measures the rate of doing electrical work.

232. The most suitable unit for expressing nuclear radius is_______?

• A. Angstrom
• B. Micro
• C. Nano meter
• D. Fermi

Explanation: A fermi, equal to 10^-15 metre, is suitable for nuclear dimensions because atomic nuclei are only a few femtometres across. Angstroms and nanometres are more appropriate for atomic and molecular scales.

233. Name the Scientist who stated that matter can be converted into energy?

• A. Boyle
• B. Einstein
• C. Avogadro
• D. Lavoisier

Explanation: Einstein established the mass-energy equivalence expressed by E = mc², showing that mass can be converted into energy and vice versa. Boyle and Lavoisier made important chemical contributions but did not state this relation.

234. By which process does the smell of cooking spread to all the rooms in a house?

• A. Distillation
• B. Diffusion
• C. Decomposition
• D. Displacement

Explanation: Diffusion causes cooking-smell molecules to move from the region of higher concentration near the kitchen into rooms where their concentration is lower. Distillation and decomposition are unrelated processes.

235. Which of the following waves have smallest velocity in vacuum?

• A. Ultraviolet
• B. Sound
• C. Infra-Red
• D. Micro

Explanation: Sound cannot propagate through a vacuum because it needs a material medium, so it has no meaningful velocity there. Ultraviolet, infrared, and microwaves are electromagnetic waves and all travel at the same speed in vacuum.

236. The process whereby energy is dissipated from the oscillating system is called__________?

• A. Oscillation
• B. Damping
• C. Resonance
• D. None of these

Explanation: Damping is the gradual loss of energy from an oscillating system due to friction or resistance, causing its amplitude to decrease. Resonance, by contrast, is the large response produced when a system is driven at its natural frequency.

237. Internal friction of fluid is called_________?

• A. Viscosity
• B. Surface tension
• C. Resistance
• D. Cohesive force

Explanation: Viscosity is the internal friction that opposes the relative motion of adjacent layers in a fluid. Surface tension acts at a liquid surface, so it is not the same property.

238. According to which law gas is directly proportional to temperature?

• A. Charles Law
• B. Boyles Law
• C. Grams Law
• D. Dalton's Law

Explanation: Charles’s law states that, at constant pressure, a gas’s volume increases directly with its absolute temperature. Boyle’s law instead relates pressure and volume inversely at constant temperature.

239. Who said that light is made of corpuscles/particles?

• A. Maxwell
• B. Einstein
• C. Newton
• D. Huygein

Explanation: Newton proposed the corpuscular theory, which treated light as a stream of tiny particles or corpuscles. Maxwell’s work described light as an electromagnetic wave, while Einstein later explained light quanta.

240. Albert Einstein was a____________?

• A. Physicist
• B. Physician
• C. Chemist
• D. Biologist

Explanation: Albert Einstein was a physicist whose work explained the photoelectric effect, special and general relativity, and the relationship between mass and energy. He was not a physician, despite the similar spelling of that option.